Driving gear for door motors



July 7, 1925. 1,544,961

P. M. GRIFFIN DRIVING GEAR FOR DOOR MOTORS Filed April 12, 1922 u a; 31 22 f 27 1 21 26 29 Q 32 34 J9 20 1! o1 6 6 J 44 7 L no;

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33x Welt km Patented July 7, 1925.

UNITED STATES PATENT OFFICE.

PERCY M. GRIFFIN, F ALBANY, NEW YORK, ASSIGNOR TO CONSOLIDATED CAR:

1 HEATING COMPANY, ,OF ALBANY, NEW YORK, A CORPORATION OF GINIA.

WEST VIR- DRIVING GEAR FOR DOOR MOTORS.

Application filed April 12, 1922. Serial No. 551,952.

To all whom it may concern:

Be it known that I, PERCY M. GRIFFIN, a citizen of the United States, residing at Albany, inthe county of Albany and State of New York, have invented certain new and useful Improvements in Driving Gear for Door Motors, the following being a full, clear, and exact disclosure of the one form of my invention which I at present deem preferable.

For a detailed description of the present form of my invention, reference may be had to the following specification and to the accompanying drawing, wherein Fig. l is a section view of my device;

Figs. 2 and 3 are details. I

My invention relates to a transmission or power-conveying agency to be interposed between a door-motor and the door operated thereby for the purpose of 'providing a yielding drive that will cause the stoppage or reversal of the-motor in the event of the door being blocked or obstructed. This transmission is in the nature of a-difl'erential, planetary gearing in which the driving tion with a pneumatic or other fluid-pressure type of engine, in which case, theinitial reduction gearing may be omitted. The shaft of motor 1 is coupled to the primary shaft- 3 in bearings 4 ,by means of a coupling 2.

an The shaft 3 drives worm-wheel 6 by means of a screw 5 and a pinion 9 is fastflon shaft 7 of said wheel 6, this shaft 7 being journalled in the housing by bearings 8. The pinion 9 drives a gear-wheel 10 which carries as the floating member of a planetary gearing a bevelled pinion on a projection 14 in which the stud-shaft 16 of the pinion is journalled. Wheel 10 has a hollow shaft 11, in bearings 12, with a radial arm 42 thereon to operate the limit-switches 40 and 41 at the end of'each run of the door. Through 'hollow shaft 11 passes loosely a shaft 13 which acts to control the floating member and carries on hub 35 a radial arm 36, that, during the door-closing movement,

bears against a yielding stop or abutment formed by spring 37 which, in turn, rests against screw-plug 38 in the wall of the housing. Movable with the arm 36 is a switch-operating arm 36, the functions of which will be later described. A fixed stop 37 engaged by arm 36 prevents its rotation in the opposite direction. On the outer end of shaft 13 aforesaid is a bevelled gearwheel 17 engaging said pinion 15,- while in line with 17 is a similar wheel 18 (on shaft 19 in bearings 20) which also engages pinion 15. On said shaft 19 is secured a radial arm 32 which at each end of its arc of travel strikes one or the other of the pneumatic buffers -33.and 34. On the outer end of shaft 19 is a toothed clutch-member 2.1 which normally engages a similar member 22 that slides on and rotates with the hub of a bracket 24, which is normally supported and guided by an'extension 23 of shaft 19. Said bracket 24 carries the usual door-operating arm 25-. A spring 31 normally presses clutch member 22 into engagement with member 21. A lever 28, pivoted at 29, has fingers extending into a groove in member 22 for working the clutch manually and also has a cam-lever mounted thereon at 27 and pro-- vided with a handle 26. By moving this handle 26in the direction of the arrow, the cam lever 30 is forced against the wall of the housing and thereby moves lever 28, against the force of spring 31 aforesaid, todisengage the clutch. WVhen the clutch is disengaged the door may be moved by hand, but when the lever is engaged, wherever therdoor may stand, the clutchmembers will snap bac into engagement whenever their teeth come into the right position after the-starting up of the engine.

. v The operation of the above described gear- 'ing'will be evident. The motor will rotate wheel 10, and, since the wheel 17 is held against rotation (by the spring stop on the door-closing movement and by the fixed stop on the door-opening movement) the pinion 15 will rotate, as it travels around 17, and

thereby compel wheel 18 to rotate and operatev the door through the agency of shaft 19,

clutch-members "21, 22, bracket 24 and arm The driving pressure also reacts on 25. wheel 17 and, if the pressure isacting to close the door, and if, because of the door being blocked or obstructed, the pressure exceeds a predetermined value or magnitude,

then the spring stop or abutment 37 will yield and allow a slight rotation of shaft 13 together with arm 36 and hub. 35. As appears in Fig. 2, that Will also rotate a second arm 36 on hub 35, which will operate an electric switch 39 to either stop or reverse the motor. If it is to merely stop the motor, the switch 39 will be in the main motor circuit, while if it is to reverse it, the switch will be in the circuit of a magnet acting on the engine reverser. I prefer the former allowing spring 37 to reverse the motor mechanically until its circuit is reclosed and the same action repeated until the obstruction is removed.

What I claim as new and desire to secure by Letters Patentis:

1. The combination with a rotatable shaft provided with a door motor of a door-operating transmission including a member reacting against a normally stationary yieldable abutment, and a controlling device for the motor operated by said member.

2. The combination with a door motor of a door-operating transmission including a rotatable shaft provided with a member reacting under the door-closing pressure against a normally stationary yieldable abutment, and a controlling device for the motor operated thereby.

3. The combination with a door motor of a door operating. transmission including a normally stationar yieldable abutment, a motor-driven member acting on the door and having means engaging said abutment, and a controller for the motor operated thereby.

4. The combination with a door motor of'a door-operating transmission including a motor-driven shaft, gearing between said shaft and the motor, a normally stationary yieldable abutment, gearing between said shaft and said abutment, and a motor controller operated by the yielding of the abutment.

5. The combination with a door motor of a door-operating transmission including a motor-driven shaft provided with .a rigid abutment, a gearing operated thereby, a yieldable abutment normally engaging said shaft abutment, said gearing exerting pressure against the doorand reactionary pressure againstsaid abutment, and a controller for the motor operated by the'abutment pressure.

6. A transmission adapted to be interposed between a door and its operating motor comprising a differential, planetary gearing having its floatingmember controlled by a yielding abutment, a door-op-.

crating arm, and a motor-controlling switch operated by the yielding of said abutment;

7. A door-motor transmission comprising a door-operating member provided with a yieldable member operable when power applied thereto exceeds a predetermined value,

a motor controlling switch operated by said yieldable member, and a manual clutch for disconnecting the door-operating member.

8. A door motor transmission gear comprising a reversible rotary motor moving gear driven thereby, a motor-controlling switch operated by the back-pressure on the door, an oscillating door-operating arm, and a clutch for disconnecting the door.

11. A door motor transmission comprising a rotary member, a door operating arm driven thereby, a yieldable stop cooperating with said member to neutralize its door closing movement when said movement is resisted by an abnormal force, and limit switches operated by the rotary member at each end of the door movement.

Signed at Albany, county of Albany, and State of New York, this 3rd day of April, 1922.

PERCY M.-GRI FFIN. 

